Hagfish are scaleless, jawless, boneless fish that have a skeleton of cartilage and look somewhat like an eel. Growing up to 35 inches and covered with slime, they have a head with thick barbels, a skull of cartilage and no backbone or jaw. They don’t look like a fish at all. These fish have over 100 slime glands that secrete slime through between 90 and 200 pores located down the length of their body.